Make reading list entry movable only

ios/chrome/browser/reading_list/reading_list_entry_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ios/chrome/browser/reading_list/reading_list_entry.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(ReadingListEntry, CompareIgnoreTitle) {
   const ReadingListEntry e1(GURL("http://example.com"), "bar");
   const ReadingListEntry e2(GURL("http://example.com"), "foo");
 
   EXPECT_EQ(e1, e2);
 }
 
 TEST(ReadingListEntry, CompareFailureIgnoreTitle) {
   const ReadingListEntry e1(GURL("http://example.com"), "bar");
   const ReadingListEntry e2(GURL("http://example.org"), "bar");
 
   EXPECT_FALSE(e1 == e2);
 }
 
-TEST(ReadingListEntry, CopyAreEquals) {
-  const ReadingListEntry e1(GURL("http://example.com"), "bar");
-  const ReadingListEntry e2(e1);
+TEST(ReadingListEntry, MovesAreEquals) {
+  ReadingListEntry e1(GURL("http://example.com"), "bar");
+  ReadingListEntry e2(GURL("http://example.com"), "bar");
+  ASSERT_EQ(e1, e2);
+  ASSERT_EQ(e1.Title(), e2.Title());
 
-  EXPECT_EQ(e1, e2);
-  EXPECT_EQ(e1.Title(), e2.Title());
+  ReadingListEntry e3(std::move(e1));
+
+  EXPECT_EQ(e3, e2);
+  EXPECT_EQ(e3.Title(), e2.Title());
 }
 
 TEST(ReadingListEntry, DistilledURL) {
   ReadingListEntry e(GURL("http://example.com"), "bar");
 
   EXPECT_FALSE(e.DistilledURL().is_valid());
 
   const GURL distilled_url("http://distilled.example.com");
   e.SetDistilledURL(distilled_url);
   EXPECT_EQ(distilled_url, e.DistilledURL());
 }
 
 TEST(ReadingListEntry, DistilledState) {
   ReadingListEntry e(GURL("http://example.com"), "bar");
 
   EXPECT_EQ(ReadingListEntry::WAITING, e.DistilledState());
 
   e.SetDistilledState(ReadingListEntry::ERROR);
   EXPECT_EQ(ReadingListEntry::ERROR, e.DistilledState());
 
   const GURL distilled_url("http://distilled.example.com");
   e.SetDistilledURL(distilled_url);
   EXPECT_EQ(ReadingListEntry::PROCESSED, e.DistilledState());
 }